An authentication bypass using an alternate path or channel [CWE-288] vulnerability in Fortinet FortiOS version 6.4.0 through 6.4.15 and before 6.2.16, FortiProxy version 7.4.0 through 7.4.2, 7.2.0 through 7.2.8 and before 7.0.15 & FortiPAM before version 1.2.0 allows an unauthenticated attacker to seize control of a managed device via crafted FGFM requests, if the device is managed by a FortiManager, and if the attacker knows that FortiManagers serial number.
A product requires authentication, but the product has an alternate path or channel that does not require authentication.